Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1 | /* |
Mike Frysinger | 1ba7a3e | 2008-01-11 15:56:26 +0800 | [diff] [blame] | 2 | * Blackfin On-Chip Serial Driver |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 3 | * |
Mike Frysinger | 1ba7a3e | 2008-01-11 15:56:26 +0800 | [diff] [blame] | 4 | * Copyright 2006-2007 Analog Devices Inc. |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 5 | * |
Mike Frysinger | 1ba7a3e | 2008-01-11 15:56:26 +0800 | [diff] [blame] | 6 | * Enter bugs at http://blackfin.uclinux.org/ |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 7 | * |
Mike Frysinger | 1ba7a3e | 2008-01-11 15:56:26 +0800 | [diff] [blame] | 8 | * Licensed under the GPL-2 or later. |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 12 | #define SUPPORT_SYSRQ |
| 13 | #endif |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/ioport.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/console.h> |
| 19 | #include <linux/sysrq.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/tty.h> |
| 22 | #include <linux/tty_flip.h> |
| 23 | #include <linux/serial_core.h> |
| 24 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 25 | #ifdef CONFIG_KGDB_UART |
| 26 | #include <linux/kgdb.h> |
| 27 | #include <asm/irq_regs.h> |
| 28 | #endif |
| 29 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 30 | #include <asm/gpio.h> |
| 31 | #include <asm/mach/bfin_serial_5xx.h> |
| 32 | |
| 33 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 34 | #include <linux/dma-mapping.h> |
| 35 | #include <asm/io.h> |
| 36 | #include <asm/irq.h> |
| 37 | #include <asm/cacheflush.h> |
| 38 | #endif |
| 39 | |
| 40 | /* UART name and device definitions */ |
| 41 | #define BFIN_SERIAL_NAME "ttyBF" |
| 42 | #define BFIN_SERIAL_MAJOR 204 |
| 43 | #define BFIN_SERIAL_MINOR 64 |
| 44 | |
| 45 | /* |
| 46 | * Setup for console. Argument comes from the menuconfig |
| 47 | */ |
| 48 | #define DMA_RX_XCOUNT 512 |
| 49 | #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT) |
| 50 | |
Sonic Zhang | 0aef456 | 2008-02-29 12:08:42 +0800 | [diff] [blame] | 51 | #define DMA_RX_FLUSH_JIFFIES (HZ / 50) |
Sonic Zhang | f30ac0c | 2008-06-19 17:46:39 +0800 | [diff] [blame] | 52 | #define CTS_CHECK_JIFFIES (HZ / 50) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 53 | |
| 54 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 55 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); |
| 56 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 57 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 58 | #endif |
| 59 | |
| 60 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart); |
| 61 | |
| 62 | /* |
| 63 | * interrupts are disabled on entry |
| 64 | */ |
| 65 | static void bfin_serial_stop_tx(struct uart_port *port) |
| 66 | { |
| 67 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 68 | struct circ_buf *xmit = &uart->port.info->xmit; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 69 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 70 | while (!(UART_GET_LSR(uart) & TEMT)) |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 71 | cpu_relax(); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 72 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 73 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 74 | disable_dma(uart->tx_dma_channel); |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 75 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
| 76 | uart->port.icount.tx += uart->tx_count; |
| 77 | uart->tx_count = 0; |
| 78 | uart->tx_done = 1; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 79 | #else |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 80 | #ifdef CONFIG_BF54x |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 81 | /* Clear TFI bit */ |
| 82 | UART_PUT_LSR(uart, TFI); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 83 | #endif |
Mike Frysinger | 89bf6dc5 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 84 | UART_CLEAR_IER(uart, ETBEI); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 85 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | /* |
| 89 | * port is locked and interrupts are disabled |
| 90 | */ |
| 91 | static void bfin_serial_start_tx(struct uart_port *port) |
| 92 | { |
| 93 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 94 | |
| 95 | #ifdef CONFIG_SERIAL_BFIN_DMA |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 96 | if (uart->tx_done) |
| 97 | bfin_serial_dma_tx_chars(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 98 | #else |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 99 | UART_SET_IER(uart, ETBEI); |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 100 | bfin_serial_tx_chars(uart); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 101 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Interrupts are enabled |
| 106 | */ |
| 107 | static void bfin_serial_stop_rx(struct uart_port *port) |
| 108 | { |
| 109 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
Mike Frysinger | 89bf6dc5 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 110 | #ifdef CONFIG_KGDB_UART |
| 111 | if (uart->port.line != CONFIG_KGDB_UART_PORT) |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 112 | #endif |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 113 | UART_CLEAR_IER(uart, ERBFI); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Set the modem control timer to fire immediately. |
| 118 | */ |
| 119 | static void bfin_serial_enable_ms(struct uart_port *port) |
| 120 | { |
| 121 | } |
| 122 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 123 | #ifdef CONFIG_KGDB_UART |
| 124 | static int kgdb_entry_state; |
| 125 | |
| 126 | void kgdb_put_debug_char(int chr) |
| 127 | { |
| 128 | struct bfin_serial_port *uart; |
| 129 | |
Graf Yang | 2ade972 | 2008-04-25 02:55:49 +0800 | [diff] [blame] | 130 | if (CONFIG_KGDB_UART_PORT < 0 |
| 131 | || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS) |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 132 | uart = &bfin_serial_ports[0]; |
| 133 | else |
| 134 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 135 | |
| 136 | while (!(UART_GET_LSR(uart) & THRE)) { |
Mike Frysinger | d5148ff | 2007-07-25 11:57:42 +0800 | [diff] [blame] | 137 | SSYNC(); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 138 | } |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 139 | |
Mike Frysinger | 45828b8 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 140 | UART_CLEAR_DLAB(uart); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 141 | UART_PUT_CHAR(uart, (unsigned char)chr); |
Mike Frysinger | d5148ff | 2007-07-25 11:57:42 +0800 | [diff] [blame] | 142 | SSYNC(); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | int kgdb_get_debug_char(void) |
| 146 | { |
| 147 | struct bfin_serial_port *uart; |
| 148 | unsigned char chr; |
| 149 | |
Graf Yang | 2ade972 | 2008-04-25 02:55:49 +0800 | [diff] [blame] | 150 | if (CONFIG_KGDB_UART_PORT < 0 |
| 151 | || CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS) |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 152 | uart = &bfin_serial_ports[0]; |
| 153 | else |
| 154 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 155 | |
| 156 | while(!(UART_GET_LSR(uart) & DR)) { |
Mike Frysinger | d5148ff | 2007-07-25 11:57:42 +0800 | [diff] [blame] | 157 | SSYNC(); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 158 | } |
Mike Frysinger | 45828b8 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 159 | UART_CLEAR_DLAB(uart); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 160 | chr = UART_GET_CHAR(uart); |
Mike Frysinger | d5148ff | 2007-07-25 11:57:42 +0800 | [diff] [blame] | 161 | SSYNC(); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 162 | |
| 163 | return chr; |
| 164 | } |
| 165 | #endif |
| 166 | |
Mike Frysinger | 50e2e15 | 2008-04-25 03:03:03 +0800 | [diff] [blame] | 167 | #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO) |
Mike Frysinger | 8851c71 | 2007-12-24 19:48:04 +0800 | [diff] [blame] | 168 | # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold) |
| 169 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v)) |
| 170 | #else |
| 171 | # define UART_GET_ANOMALY_THRESHOLD(uart) 0 |
| 172 | # define UART_SET_ANOMALY_THRESHOLD(uart, v) |
| 173 | #endif |
| 174 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 175 | #ifdef CONFIG_SERIAL_BFIN_PIO |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 176 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) |
| 177 | { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 178 | struct tty_struct *tty = uart->port.info->port.tty; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 179 | unsigned int status, ch, flg; |
Mike Frysinger | 8851c71 | 2007-12-24 19:48:04 +0800 | [diff] [blame] | 180 | static struct timeval anomaly_start = { .tv_sec = 0 }; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 181 | |
Sonic Zhang | 759eb04 | 2007-11-21 17:00:32 +0800 | [diff] [blame] | 182 | status = UART_GET_LSR(uart); |
Mike Frysinger | 0bcfd70 | 2007-12-24 19:40:05 +0800 | [diff] [blame] | 183 | UART_CLEAR_LSR(uart); |
| 184 | |
| 185 | ch = UART_GET_CHAR(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 186 | uart->port.icount.rx++; |
| 187 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 188 | #ifdef CONFIG_KGDB_UART |
| 189 | if (uart->port.line == CONFIG_KGDB_UART_PORT) { |
Mike Frysinger | 89bf6dc5 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 190 | struct pt_regs *regs = get_irq_regs(); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 191 | if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */ |
| 192 | kgdb_breakkey_pressed(regs); |
| 193 | return; |
| 194 | } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */ |
| 195 | kgdb_entry_state = 1; |
| 196 | } else if (kgdb_entry_state == 1 && ch == 'q') { |
| 197 | kgdb_entry_state = 0; |
| 198 | kgdb_breakkey_pressed(regs); |
| 199 | return; |
| 200 | } else if (ch == 0x3) {/* Ctrl + C */ |
| 201 | kgdb_entry_state = 0; |
| 202 | kgdb_breakkey_pressed(regs); |
| 203 | return; |
| 204 | } else { |
| 205 | kgdb_entry_state = 0; |
| 206 | } |
| 207 | } |
| 208 | #endif |
Mike Frysinger | bbf275f | 2007-08-05 16:48:08 +0800 | [diff] [blame] | 209 | |
Mike Frysinger | 50e2e15 | 2008-04-25 03:03:03 +0800 | [diff] [blame] | 210 | if (ANOMALY_05000363) { |
Mike Frysinger | 8851c71 | 2007-12-24 19:48:04 +0800 | [diff] [blame] | 211 | /* The BF533 (and BF561) family of processors have a nice anomaly |
| 212 | * where they continuously generate characters for a "single" break. |
Mike Frysinger | bbf275f | 2007-08-05 16:48:08 +0800 | [diff] [blame] | 213 | * We have to basically ignore this flood until the "next" valid |
Mike Frysinger | 8851c71 | 2007-12-24 19:48:04 +0800 | [diff] [blame] | 214 | * character comes across. Due to the nature of the flood, it is |
| 215 | * not possible to reliably catch bytes that are sent too quickly |
| 216 | * after this break. So application code talking to the Blackfin |
| 217 | * which sends a break signal must allow at least 1.5 character |
| 218 | * times after the end of the break for things to stabilize. This |
| 219 | * timeout was picked as it must absolutely be larger than 1 |
| 220 | * character time +/- some percent. So 1.5 sounds good. All other |
| 221 | * Blackfin families operate properly. Woo. |
Mike Frysinger | bbf275f | 2007-08-05 16:48:08 +0800 | [diff] [blame] | 222 | */ |
Mike Frysinger | 8851c71 | 2007-12-24 19:48:04 +0800 | [diff] [blame] | 223 | if (anomaly_start.tv_sec) { |
| 224 | struct timeval curr; |
| 225 | suseconds_t usecs; |
| 226 | |
| 227 | if ((~ch & (~ch + 1)) & 0xff) |
| 228 | goto known_good_char; |
| 229 | |
| 230 | do_gettimeofday(&curr); |
| 231 | if (curr.tv_sec - anomaly_start.tv_sec > 1) |
| 232 | goto known_good_char; |
| 233 | |
| 234 | usecs = 0; |
| 235 | if (curr.tv_sec != anomaly_start.tv_sec) |
| 236 | usecs += USEC_PER_SEC; |
| 237 | usecs += curr.tv_usec - anomaly_start.tv_usec; |
| 238 | |
| 239 | if (usecs > UART_GET_ANOMALY_THRESHOLD(uart)) |
| 240 | goto known_good_char; |
| 241 | |
| 242 | if (ch) |
| 243 | anomaly_start.tv_sec = 0; |
| 244 | else |
| 245 | anomaly_start = curr; |
| 246 | |
| 247 | return; |
| 248 | |
| 249 | known_good_char: |
| 250 | anomaly_start.tv_sec = 0; |
Mike Frysinger | bbf275f | 2007-08-05 16:48:08 +0800 | [diff] [blame] | 251 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 252 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 253 | |
| 254 | if (status & BI) { |
Mike Frysinger | 50e2e15 | 2008-04-25 03:03:03 +0800 | [diff] [blame] | 255 | if (ANOMALY_05000363) |
Mike Frysinger | 8851c71 | 2007-12-24 19:48:04 +0800 | [diff] [blame] | 256 | if (bfin_revid() < 5) |
| 257 | do_gettimeofday(&anomaly_start); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 258 | uart->port.icount.brk++; |
| 259 | if (uart_handle_break(&uart->port)) |
| 260 | goto ignore_char; |
Mike Frysinger | 9808901 | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 261 | status &= ~(PE | FE); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 262 | } |
| 263 | if (status & PE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 264 | uart->port.icount.parity++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 265 | if (status & OE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 266 | uart->port.icount.overrun++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 267 | if (status & FE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 268 | uart->port.icount.frame++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 269 | |
| 270 | status &= uart->port.read_status_mask; |
| 271 | |
| 272 | if (status & BI) |
| 273 | flg = TTY_BREAK; |
| 274 | else if (status & PE) |
| 275 | flg = TTY_PARITY; |
| 276 | else if (status & FE) |
| 277 | flg = TTY_FRAME; |
| 278 | else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 279 | flg = TTY_NORMAL; |
| 280 | |
| 281 | if (uart_handle_sysrq_char(&uart->port, ch)) |
| 282 | goto ignore_char; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 283 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 284 | uart_insert_char(&uart->port, status, OE, ch, flg); |
| 285 | |
| 286 | ignore_char: |
| 287 | tty_flip_buffer_push(tty); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) |
| 291 | { |
| 292 | struct circ_buf *xmit = &uart->port.info->xmit; |
| 293 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 294 | /* |
| 295 | * Check the modem control lines before |
| 296 | * transmitting anything. |
| 297 | */ |
| 298 | bfin_serial_mctrl_check(uart); |
| 299 | |
| 300 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
| 301 | bfin_serial_stop_tx(&uart->port); |
| 302 | return; |
| 303 | } |
| 304 | |
Sonic Zhang | f30ac0c | 2008-06-19 17:46:39 +0800 | [diff] [blame] | 305 | if (uart->port.x_char) { |
| 306 | UART_PUT_CHAR(uart, uart->port.x_char); |
| 307 | uart->port.icount.tx++; |
| 308 | uart->port.x_char = 0; |
| 309 | } |
| 310 | |
Sonic Zhang | 759eb04 | 2007-11-21 17:00:32 +0800 | [diff] [blame] | 311 | while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) { |
| 312 | UART_PUT_CHAR(uart, xmit->buf[xmit->tail]); |
| 313 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 314 | uart->port.icount.tx++; |
| 315 | SSYNC(); |
| 316 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 317 | |
| 318 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 319 | uart_write_wakeup(&uart->port); |
| 320 | |
| 321 | if (uart_circ_empty(xmit)) |
| 322 | bfin_serial_stop_tx(&uart->port); |
| 323 | } |
| 324 | |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 325 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) |
| 326 | { |
| 327 | struct bfin_serial_port *uart = dev_id; |
| 328 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 329 | spin_lock(&uart->port.lock); |
Mike Frysinger | 0bcfd70 | 2007-12-24 19:40:05 +0800 | [diff] [blame] | 330 | while (UART_GET_LSR(uart) & DR) |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 331 | bfin_serial_rx_chars(uart); |
| 332 | spin_unlock(&uart->port.lock); |
Sonic Zhang | 759eb04 | 2007-11-21 17:00:32 +0800 | [diff] [blame] | 333 | |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 334 | return IRQ_HANDLED; |
| 335 | } |
| 336 | |
| 337 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 338 | { |
| 339 | struct bfin_serial_port *uart = dev_id; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 340 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 341 | spin_lock(&uart->port.lock); |
Mike Frysinger | 0bcfd70 | 2007-12-24 19:40:05 +0800 | [diff] [blame] | 342 | if (UART_GET_LSR(uart) & THRE) |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 343 | bfin_serial_tx_chars(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 344 | spin_unlock(&uart->port.lock); |
Sonic Zhang | 759eb04 | 2007-11-21 17:00:32 +0800 | [diff] [blame] | 345 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 346 | return IRQ_HANDLED; |
| 347 | } |
Sonic Zhang | 4cb4f22 | 2008-02-02 14:29:25 +0800 | [diff] [blame] | 348 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 349 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 350 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 351 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) |
| 352 | { |
| 353 | struct circ_buf *xmit = &uart->port.info->xmit; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 354 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 355 | uart->tx_done = 0; |
| 356 | |
Sonic Zhang | f30ac0c | 2008-06-19 17:46:39 +0800 | [diff] [blame] | 357 | /* |
| 358 | * Check the modem control lines before |
| 359 | * transmitting anything. |
| 360 | */ |
| 361 | bfin_serial_mctrl_check(uart); |
| 362 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 363 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 364 | uart->tx_count = 0; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 365 | uart->tx_done = 1; |
| 366 | return; |
| 367 | } |
| 368 | |
Sonic Zhang | 1b73351 | 2007-12-21 16:45:12 +0800 | [diff] [blame] | 369 | if (uart->port.x_char) { |
| 370 | UART_PUT_CHAR(uart, uart->port.x_char); |
| 371 | uart->port.icount.tx++; |
| 372 | uart->port.x_char = 0; |
| 373 | } |
| 374 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 375 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); |
| 376 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) |
| 377 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; |
| 378 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), |
| 379 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); |
| 380 | set_dma_config(uart->tx_dma_channel, |
| 381 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, |
| 382 | INTR_ON_BUF, |
| 383 | DIMENSION_LINEAR, |
Michael Hennerich | 2047e40 | 2008-01-22 15:29:18 +0800 | [diff] [blame] | 384 | DATA_SIZE_8, |
| 385 | DMA_SYNC_RESTART)); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 386 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); |
| 387 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); |
| 388 | set_dma_x_modify(uart->tx_dma_channel, 1); |
| 389 | enable_dma(uart->tx_dma_channel); |
Sonic Zhang | 99ee7b5 | 2007-12-21 17:12:55 +0800 | [diff] [blame] | 390 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 391 | UART_SET_IER(uart, ETBEI); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 394 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 395 | { |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 396 | struct tty_struct *tty = uart->port.info->port.tty; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 397 | int i, flg, status; |
| 398 | |
| 399 | status = UART_GET_LSR(uart); |
Mike Frysinger | 0bcfd70 | 2007-12-24 19:40:05 +0800 | [diff] [blame] | 400 | UART_CLEAR_LSR(uart); |
| 401 | |
Sonic Zhang | 56f5de8 | 2008-02-25 15:19:09 +0800 | [diff] [blame] | 402 | uart->port.icount.rx += |
| 403 | CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, |
| 404 | UART_XMIT_SIZE); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 405 | |
| 406 | if (status & BI) { |
| 407 | uart->port.icount.brk++; |
| 408 | if (uart_handle_break(&uart->port)) |
| 409 | goto dma_ignore_char; |
Mike Frysinger | 9808901 | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 410 | status &= ~(PE | FE); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 411 | } |
| 412 | if (status & PE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 413 | uart->port.icount.parity++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 414 | if (status & OE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 415 | uart->port.icount.overrun++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 416 | if (status & FE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 417 | uart->port.icount.frame++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 418 | |
| 419 | status &= uart->port.read_status_mask; |
| 420 | |
| 421 | if (status & BI) |
| 422 | flg = TTY_BREAK; |
| 423 | else if (status & PE) |
| 424 | flg = TTY_PARITY; |
| 425 | else if (status & FE) |
| 426 | flg = TTY_FRAME; |
| 427 | else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 428 | flg = TTY_NORMAL; |
| 429 | |
Sonic Zhang | 56f5de8 | 2008-02-25 15:19:09 +0800 | [diff] [blame] | 430 | for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) { |
| 431 | if (i >= UART_XMIT_SIZE) |
| 432 | i = 0; |
| 433 | if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) |
| 434 | uart_insert_char(&uart->port, status, OE, |
| 435 | uart->rx_dma_buf.buf[i], flg); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 436 | } |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 437 | |
| 438 | dma_ignore_char: |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 439 | tty_flip_buffer_push(tty); |
| 440 | } |
| 441 | |
| 442 | void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) |
| 443 | { |
| 444 | int x_pos, pos; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 445 | |
Sonic Zhang | 56f5de8 | 2008-02-25 15:19:09 +0800 | [diff] [blame] | 446 | uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel); |
| 447 | x_pos = get_dma_curr_xcount(uart->rx_dma_channel); |
| 448 | uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows; |
| 449 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT) |
| 450 | uart->rx_dma_nrows = 0; |
| 451 | x_pos = DMA_RX_XCOUNT - x_pos; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 452 | if (x_pos == DMA_RX_XCOUNT) |
| 453 | x_pos = 0; |
| 454 | |
| 455 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; |
Sonic Zhang | 56f5de8 | 2008-02-25 15:19:09 +0800 | [diff] [blame] | 456 | if (pos != uart->rx_dma_buf.tail) { |
| 457 | uart->rx_dma_buf.head = pos; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 458 | bfin_serial_dma_rx_chars(uart); |
Sonic Zhang | 56f5de8 | 2008-02-25 15:19:09 +0800 | [diff] [blame] | 459 | uart->rx_dma_buf.tail = uart->rx_dma_buf.head; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 460 | } |
Sonic Zhang | 0aef456 | 2008-02-29 12:08:42 +0800 | [diff] [blame] | 461 | |
Sonic Zhang | 0a27842 | 2008-04-25 04:36:47 +0800 | [diff] [blame] | 462 | mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) |
| 466 | { |
| 467 | struct bfin_serial_port *uart = dev_id; |
| 468 | struct circ_buf *xmit = &uart->port.info->xmit; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 469 | |
| 470 | spin_lock(&uart->port.lock); |
| 471 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 472 | disable_dma(uart->tx_dma_channel); |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 473 | clear_dma_irqstat(uart->tx_dma_channel); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 474 | UART_CLEAR_IER(uart, ETBEI); |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 475 | xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1); |
| 476 | uart->port.icount.tx += uart->tx_count; |
Sonic Zhang | 1b73351 | 2007-12-21 16:45:12 +0800 | [diff] [blame] | 477 | |
Sonic Zhang | 56f5de8 | 2008-02-25 15:19:09 +0800 | [diff] [blame] | 478 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 479 | uart_write_wakeup(&uart->port); |
| 480 | |
Sonic Zhang | 1b73351 | 2007-12-21 16:45:12 +0800 | [diff] [blame] | 481 | bfin_serial_dma_tx_chars(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 482 | } |
| 483 | |
| 484 | spin_unlock(&uart->port.lock); |
| 485 | return IRQ_HANDLED; |
| 486 | } |
| 487 | |
| 488 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) |
| 489 | { |
| 490 | struct bfin_serial_port *uart = dev_id; |
| 491 | unsigned short irqstat; |
Sonic Zhang | 0711d85 | 2008-02-25 15:16:50 +0800 | [diff] [blame] | 492 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 493 | spin_lock(&uart->port.lock); |
| 494 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); |
| 495 | clear_dma_irqstat(uart->rx_dma_channel); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 496 | spin_unlock(&uart->port.lock); |
Sonic Zhang | 0aef456 | 2008-02-29 12:08:42 +0800 | [diff] [blame] | 497 | |
Sonic Zhang | 0a27842 | 2008-04-25 04:36:47 +0800 | [diff] [blame] | 498 | mod_timer(&(uart->rx_dma_timer), jiffies); |
Sonic Zhang | 0aef456 | 2008-02-29 12:08:42 +0800 | [diff] [blame] | 499 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 500 | return IRQ_HANDLED; |
| 501 | } |
| 502 | #endif |
| 503 | |
| 504 | /* |
| 505 | * Return TIOCSER_TEMT when transmitter is not busy. |
| 506 | */ |
| 507 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) |
| 508 | { |
| 509 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 510 | unsigned short lsr; |
| 511 | |
| 512 | lsr = UART_GET_LSR(uart); |
| 513 | if (lsr & TEMT) |
| 514 | return TIOCSER_TEMT; |
| 515 | else |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) |
| 520 | { |
| 521 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 522 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 523 | if (uart->cts_pin < 0) |
| 524 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; |
| 525 | |
Sonic Zhang | 1feaa51 | 2008-06-03 12:19:45 +0800 | [diff] [blame] | 526 | if (UART_GET_CTS(uart)) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 527 | return TIOCM_DSR | TIOCM_CAR; |
| 528 | else |
| 529 | #endif |
| 530 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; |
| 531 | } |
| 532 | |
| 533 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 534 | { |
| 535 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 536 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 537 | if (uart->rts_pin < 0) |
| 538 | return; |
| 539 | |
| 540 | if (mctrl & TIOCM_RTS) |
Sonic Zhang | 1feaa51 | 2008-06-03 12:19:45 +0800 | [diff] [blame] | 541 | UART_CLEAR_RTS(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 542 | else |
Sonic Zhang | 1feaa51 | 2008-06-03 12:19:45 +0800 | [diff] [blame] | 543 | UART_SET_RTS(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 544 | #endif |
| 545 | } |
| 546 | |
| 547 | /* |
| 548 | * Handle any change of modem status signal since we were last called. |
| 549 | */ |
| 550 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart) |
| 551 | { |
| 552 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 553 | unsigned int status; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 554 | struct uart_info *info = uart->port.info; |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 555 | struct tty_struct *tty = info->port.tty; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 556 | |
| 557 | status = bfin_serial_get_mctrl(&uart->port); |
Sonic Zhang | 4cb4f22 | 2008-02-02 14:29:25 +0800 | [diff] [blame] | 558 | uart_handle_cts_change(&uart->port, status & TIOCM_CTS); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 559 | if (!(status & TIOCM_CTS)) { |
| 560 | tty->hw_stopped = 1; |
Sonic Zhang | f30ac0c | 2008-06-19 17:46:39 +0800 | [diff] [blame] | 561 | uart->cts_timer.data = (unsigned long)(uart); |
| 562 | uart->cts_timer.function = (void *)bfin_serial_mctrl_check; |
| 563 | uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES; |
| 564 | add_timer(&(uart->cts_timer)); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 565 | } else { |
| 566 | tty->hw_stopped = 0; |
| 567 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 568 | #endif |
| 569 | } |
| 570 | |
| 571 | /* |
| 572 | * Interrupts are always disabled. |
| 573 | */ |
| 574 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) |
| 575 | { |
Mike Frysinger | cf68676 | 2007-06-11 16:12:49 +0800 | [diff] [blame] | 576 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 577 | u16 lcr = UART_GET_LCR(uart); |
| 578 | if (break_state) |
| 579 | lcr |= SB; |
| 580 | else |
| 581 | lcr &= ~SB; |
| 582 | UART_PUT_LCR(uart, lcr); |
| 583 | SSYNC(); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | static int bfin_serial_startup(struct uart_port *port) |
| 587 | { |
| 588 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 589 | |
| 590 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 591 | dma_addr_t dma_handle; |
| 592 | |
| 593 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { |
| 594 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); |
| 595 | return -EBUSY; |
| 596 | } |
| 597 | |
| 598 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { |
| 599 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); |
| 600 | free_dma(uart->rx_dma_channel); |
| 601 | return -EBUSY; |
| 602 | } |
| 603 | |
| 604 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); |
| 605 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); |
| 606 | |
| 607 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); |
| 608 | uart->rx_dma_buf.head = 0; |
| 609 | uart->rx_dma_buf.tail = 0; |
| 610 | uart->rx_dma_nrows = 0; |
| 611 | |
| 612 | set_dma_config(uart->rx_dma_channel, |
| 613 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, |
| 614 | INTR_ON_ROW, DIMENSION_2D, |
Michael Hennerich | 2047e40 | 2008-01-22 15:29:18 +0800 | [diff] [blame] | 615 | DATA_SIZE_8, |
| 616 | DMA_SYNC_RESTART)); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 617 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); |
| 618 | set_dma_x_modify(uart->rx_dma_channel, 1); |
| 619 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); |
| 620 | set_dma_y_modify(uart->rx_dma_channel, 1); |
| 621 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); |
| 622 | enable_dma(uart->rx_dma_channel); |
| 623 | |
| 624 | uart->rx_dma_timer.data = (unsigned long)(uart); |
| 625 | uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; |
| 626 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; |
| 627 | add_timer(&(uart->rx_dma_timer)); |
| 628 | #else |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 629 | if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 630 | "BFIN_UART_RX", uart)) { |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 631 | # ifdef CONFIG_KGDB_UART |
| 632 | if (uart->port.line != CONFIG_KGDB_UART_PORT) { |
| 633 | # endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 634 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); |
| 635 | return -EBUSY; |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 636 | # ifdef CONFIG_KGDB_UART |
| 637 | } |
| 638 | # endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | if (request_irq |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 642 | (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 643 | "BFIN_UART_TX", uart)) { |
| 644 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); |
| 645 | free_irq(uart->port.irq, uart); |
| 646 | return -EBUSY; |
| 647 | } |
| 648 | #endif |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 649 | UART_SET_IER(uart, ERBFI); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 650 | return 0; |
| 651 | } |
| 652 | |
| 653 | static void bfin_serial_shutdown(struct uart_port *port) |
| 654 | { |
| 655 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 656 | |
| 657 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 658 | disable_dma(uart->tx_dma_channel); |
| 659 | free_dma(uart->tx_dma_channel); |
| 660 | disable_dma(uart->rx_dma_channel); |
| 661 | free_dma(uart->rx_dma_channel); |
| 662 | del_timer(&(uart->rx_dma_timer)); |
Sonic Zhang | 75b780b | 2007-12-21 17:03:39 +0800 | [diff] [blame] | 663 | dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 664 | #else |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 665 | #ifdef CONFIG_KGDB_UART |
| 666 | if (uart->port.line != CONFIG_KGDB_UART_PORT) |
| 667 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 668 | free_irq(uart->port.irq, uart); |
| 669 | free_irq(uart->port.irq+1, uart); |
| 670 | #endif |
| 671 | } |
| 672 | |
| 673 | static void |
| 674 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, |
| 675 | struct ktermios *old) |
| 676 | { |
| 677 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 678 | unsigned long flags; |
| 679 | unsigned int baud, quot; |
Mike Frysinger | 0c44a86 | 2008-04-24 04:56:02 +0800 | [diff] [blame] | 680 | unsigned short val, ier, lcr = 0; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 681 | |
| 682 | switch (termios->c_cflag & CSIZE) { |
| 683 | case CS8: |
| 684 | lcr = WLS(8); |
| 685 | break; |
| 686 | case CS7: |
| 687 | lcr = WLS(7); |
| 688 | break; |
| 689 | case CS6: |
| 690 | lcr = WLS(6); |
| 691 | break; |
| 692 | case CS5: |
| 693 | lcr = WLS(5); |
| 694 | break; |
| 695 | default: |
| 696 | printk(KERN_ERR "%s: word lengh not supported\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 697 | __func__); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 698 | } |
| 699 | |
| 700 | if (termios->c_cflag & CSTOPB) |
| 701 | lcr |= STB; |
Mike Frysinger | 19aa638 | 2007-06-11 16:16:45 +0800 | [diff] [blame] | 702 | if (termios->c_cflag & PARENB) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 703 | lcr |= PEN; |
Mike Frysinger | 19aa638 | 2007-06-11 16:16:45 +0800 | [diff] [blame] | 704 | if (!(termios->c_cflag & PARODD)) |
| 705 | lcr |= EPS; |
| 706 | if (termios->c_cflag & CMSPAR) |
| 707 | lcr |= STP; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 708 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 709 | port->read_status_mask = OE; |
| 710 | if (termios->c_iflag & INPCK) |
| 711 | port->read_status_mask |= (FE | PE); |
| 712 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 713 | port->read_status_mask |= BI; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 714 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 715 | /* |
| 716 | * Characters to ignore |
| 717 | */ |
| 718 | port->ignore_status_mask = 0; |
| 719 | if (termios->c_iflag & IGNPAR) |
| 720 | port->ignore_status_mask |= FE | PE; |
| 721 | if (termios->c_iflag & IGNBRK) { |
| 722 | port->ignore_status_mask |= BI; |
| 723 | /* |
| 724 | * If we're ignoring parity and break indicators, |
| 725 | * ignore overruns too (for real raw support). |
| 726 | */ |
| 727 | if (termios->c_iflag & IGNPAR) |
| 728 | port->ignore_status_mask |= OE; |
| 729 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 730 | |
| 731 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
| 732 | quot = uart_get_divisor(port, baud); |
| 733 | spin_lock_irqsave(&uart->port.lock, flags); |
| 734 | |
Mike Frysinger | 8851c71 | 2007-12-24 19:48:04 +0800 | [diff] [blame] | 735 | UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15); |
| 736 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 737 | /* Disable UART */ |
| 738 | ier = UART_GET_IER(uart); |
Sonic Zhang | 1feaa51 | 2008-06-03 12:19:45 +0800 | [diff] [blame] | 739 | UART_DISABLE_INTS(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 740 | |
| 741 | /* Set DLAB in LCR to Access DLL and DLH */ |
Mike Frysinger | 45828b8 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 742 | UART_SET_DLAB(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 743 | |
| 744 | UART_PUT_DLL(uart, quot & 0xFF); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 745 | UART_PUT_DLH(uart, (quot >> 8) & 0xFF); |
| 746 | SSYNC(); |
| 747 | |
| 748 | /* Clear DLAB in LCR to Access THR RBR IER */ |
Mike Frysinger | 45828b8 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 749 | UART_CLEAR_DLAB(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 750 | |
| 751 | UART_PUT_LCR(uart, lcr); |
| 752 | |
| 753 | /* Enable UART */ |
Sonic Zhang | 1feaa51 | 2008-06-03 12:19:45 +0800 | [diff] [blame] | 754 | UART_ENABLE_INTS(uart, ier); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 755 | |
| 756 | val = UART_GET_GCTL(uart); |
| 757 | val |= UCEN; |
| 758 | UART_PUT_GCTL(uart, val); |
| 759 | |
| 760 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 761 | } |
| 762 | |
| 763 | static const char *bfin_serial_type(struct uart_port *port) |
| 764 | { |
| 765 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 766 | |
| 767 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * Release the memory region(s) being used by 'port'. |
| 772 | */ |
| 773 | static void bfin_serial_release_port(struct uart_port *port) |
| 774 | { |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Request the memory region(s) being used by 'port'. |
| 779 | */ |
| 780 | static int bfin_serial_request_port(struct uart_port *port) |
| 781 | { |
| 782 | return 0; |
| 783 | } |
| 784 | |
| 785 | /* |
| 786 | * Configure/autoconfigure the port. |
| 787 | */ |
| 788 | static void bfin_serial_config_port(struct uart_port *port, int flags) |
| 789 | { |
| 790 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 791 | |
| 792 | if (flags & UART_CONFIG_TYPE && |
| 793 | bfin_serial_request_port(&uart->port) == 0) |
| 794 | uart->port.type = PORT_BFIN; |
| 795 | } |
| 796 | |
| 797 | /* |
| 798 | * Verify the new serial_struct (for TIOCSSERIAL). |
| 799 | * The only change we allow are to the flags and type, and |
| 800 | * even then only between PORT_BFIN and PORT_UNKNOWN |
| 801 | */ |
| 802 | static int |
| 803 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 804 | { |
| 805 | return 0; |
| 806 | } |
| 807 | |
Graf Yang | 7d01b47 | 2008-02-29 11:31:08 +0800 | [diff] [blame] | 808 | /* |
| 809 | * Enable the IrDA function if tty->ldisc.num is N_IRDA. |
| 810 | * In other cases, disable IrDA function. |
| 811 | */ |
Graf Yang | 3b8458a | 2008-06-07 15:36:33 +0800 | [diff] [blame] | 812 | static void bfin_serial_set_ldisc(struct uart_port *port) |
Graf Yang | 7d01b47 | 2008-02-29 11:31:08 +0800 | [diff] [blame] | 813 | { |
Graf Yang | 3b8458a | 2008-06-07 15:36:33 +0800 | [diff] [blame] | 814 | int line = port->line; |
Graf Yang | 7d01b47 | 2008-02-29 11:31:08 +0800 | [diff] [blame] | 815 | unsigned short val; |
| 816 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 817 | if (line >= port->info->port.tty->driver->num) |
Graf Yang | 7d01b47 | 2008-02-29 11:31:08 +0800 | [diff] [blame] | 818 | return; |
| 819 | |
Takashi Iwai | a88487c | 2008-07-16 21:54:42 +0100 | [diff] [blame] | 820 | switch (port->info->port.tty->ldisc.num) { |
Graf Yang | 7d01b47 | 2008-02-29 11:31:08 +0800 | [diff] [blame] | 821 | case N_IRDA: |
| 822 | val = UART_GET_GCTL(&bfin_serial_ports[line]); |
| 823 | val |= (IREN | RPOLC); |
| 824 | UART_PUT_GCTL(&bfin_serial_ports[line], val); |
| 825 | break; |
| 826 | default: |
| 827 | val = UART_GET_GCTL(&bfin_serial_ports[line]); |
| 828 | val &= ~(IREN | RPOLC); |
| 829 | UART_PUT_GCTL(&bfin_serial_ports[line], val); |
| 830 | } |
| 831 | } |
| 832 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 833 | static struct uart_ops bfin_serial_pops = { |
| 834 | .tx_empty = bfin_serial_tx_empty, |
| 835 | .set_mctrl = bfin_serial_set_mctrl, |
| 836 | .get_mctrl = bfin_serial_get_mctrl, |
| 837 | .stop_tx = bfin_serial_stop_tx, |
| 838 | .start_tx = bfin_serial_start_tx, |
| 839 | .stop_rx = bfin_serial_stop_rx, |
| 840 | .enable_ms = bfin_serial_enable_ms, |
| 841 | .break_ctl = bfin_serial_break_ctl, |
| 842 | .startup = bfin_serial_startup, |
| 843 | .shutdown = bfin_serial_shutdown, |
| 844 | .set_termios = bfin_serial_set_termios, |
Graf Yang | 3b8458a | 2008-06-07 15:36:33 +0800 | [diff] [blame] | 845 | .set_ldisc = bfin_serial_set_ldisc, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 846 | .type = bfin_serial_type, |
| 847 | .release_port = bfin_serial_release_port, |
| 848 | .request_port = bfin_serial_request_port, |
| 849 | .config_port = bfin_serial_config_port, |
| 850 | .verify_port = bfin_serial_verify_port, |
| 851 | }; |
| 852 | |
| 853 | static void __init bfin_serial_init_ports(void) |
| 854 | { |
| 855 | static int first = 1; |
| 856 | int i; |
| 857 | |
| 858 | if (!first) |
| 859 | return; |
| 860 | first = 0; |
| 861 | |
| 862 | for (i = 0; i < nr_ports; i++) { |
| 863 | bfin_serial_ports[i].port.uartclk = get_sclk(); |
| 864 | bfin_serial_ports[i].port.ops = &bfin_serial_pops; |
| 865 | bfin_serial_ports[i].port.line = i; |
| 866 | bfin_serial_ports[i].port.iotype = UPIO_MEM; |
| 867 | bfin_serial_ports[i].port.membase = |
| 868 | (void __iomem *)bfin_serial_resource[i].uart_base_addr; |
| 869 | bfin_serial_ports[i].port.mapbase = |
| 870 | bfin_serial_resource[i].uart_base_addr; |
| 871 | bfin_serial_ports[i].port.irq = |
| 872 | bfin_serial_resource[i].uart_irq; |
| 873 | bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF; |
| 874 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 875 | bfin_serial_ports[i].tx_done = 1; |
| 876 | bfin_serial_ports[i].tx_count = 0; |
| 877 | bfin_serial_ports[i].tx_dma_channel = |
| 878 | bfin_serial_resource[i].uart_tx_dma_channel; |
| 879 | bfin_serial_ports[i].rx_dma_channel = |
| 880 | bfin_serial_resource[i].uart_rx_dma_channel; |
| 881 | init_timer(&(bfin_serial_ports[i].rx_dma_timer)); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 882 | #endif |
| 883 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
Sonic Zhang | f30ac0c | 2008-06-19 17:46:39 +0800 | [diff] [blame] | 884 | init_timer(&(bfin_serial_ports[i].cts_timer)); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 885 | bfin_serial_ports[i].cts_pin = |
| 886 | bfin_serial_resource[i].uart_cts_pin; |
| 887 | bfin_serial_ports[i].rts_pin = |
| 888 | bfin_serial_resource[i].uart_rts_pin; |
| 889 | #endif |
| 890 | bfin_serial_hw_init(&bfin_serial_ports[i]); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 891 | } |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 892 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 896 | /* |
| 897 | * If the port was already initialised (eg, by a boot loader), |
| 898 | * try to determine the current setup. |
| 899 | */ |
| 900 | static void __init |
| 901 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, |
| 902 | int *parity, int *bits) |
| 903 | { |
| 904 | unsigned short status; |
| 905 | |
| 906 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); |
| 907 | if (status == (ERBFI | ETBEI)) { |
| 908 | /* ok, the port was enabled */ |
Mike Frysinger | 45828b8 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 909 | u16 lcr, dlh, dll; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 910 | |
| 911 | lcr = UART_GET_LCR(uart); |
| 912 | |
| 913 | *parity = 'n'; |
| 914 | if (lcr & PEN) { |
| 915 | if (lcr & EPS) |
| 916 | *parity = 'e'; |
| 917 | else |
| 918 | *parity = 'o'; |
| 919 | } |
| 920 | switch (lcr & 0x03) { |
| 921 | case 0: *bits = 5; break; |
| 922 | case 1: *bits = 6; break; |
| 923 | case 2: *bits = 7; break; |
| 924 | case 3: *bits = 8; break; |
| 925 | } |
| 926 | /* Set DLAB in LCR to Access DLL and DLH */ |
Mike Frysinger | 45828b8 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 927 | UART_SET_DLAB(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 928 | |
| 929 | dll = UART_GET_DLL(uart); |
| 930 | dlh = UART_GET_DLH(uart); |
| 931 | |
| 932 | /* Clear DLAB in LCR to Access THR RBR IER */ |
Mike Frysinger | 45828b8 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 933 | UART_CLEAR_DLAB(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 934 | |
| 935 | *baud = get_sclk() / (16*(dll | dlh << 8)); |
| 936 | } |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 937 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 938 | } |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 939 | #endif |
| 940 | |
| 941 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK) |
| 942 | static struct uart_driver bfin_serial_reg; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 943 | |
| 944 | static int __init |
| 945 | bfin_serial_console_setup(struct console *co, char *options) |
| 946 | { |
| 947 | struct bfin_serial_port *uart; |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 948 | # ifdef CONFIG_SERIAL_BFIN_CONSOLE |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 949 | int baud = 57600; |
| 950 | int bits = 8; |
| 951 | int parity = 'n'; |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 952 | # ifdef CONFIG_SERIAL_BFIN_CTSRTS |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 953 | int flow = 'r'; |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 954 | # else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 955 | int flow = 'n'; |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 956 | # endif |
| 957 | # endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 958 | |
| 959 | /* |
| 960 | * Check whether an invalid uart number has been specified, and |
| 961 | * if so, search for the first available port that does have |
| 962 | * console support. |
| 963 | */ |
| 964 | if (co->index == -1 || co->index >= nr_ports) |
| 965 | co->index = 0; |
| 966 | uart = &bfin_serial_ports[co->index]; |
| 967 | |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 968 | # ifdef CONFIG_SERIAL_BFIN_CONSOLE |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 969 | if (options) |
| 970 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 971 | else |
| 972 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); |
| 973 | |
| 974 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 975 | # else |
| 976 | return 0; |
| 977 | # endif |
| 978 | } |
| 979 | #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) || |
| 980 | defined (CONFIG_EARLY_PRINTK) */ |
| 981 | |
| 982 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE |
| 983 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) |
| 984 | { |
| 985 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 986 | while (!(UART_GET_LSR(uart) & THRE)) |
| 987 | barrier(); |
| 988 | UART_PUT_CHAR(uart, ch); |
| 989 | SSYNC(); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 990 | } |
| 991 | |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 992 | /* |
| 993 | * Interrupts are disabled on entering |
| 994 | */ |
| 995 | static void |
| 996 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) |
| 997 | { |
| 998 | struct bfin_serial_port *uart = &bfin_serial_ports[co->index]; |
| 999 | int flags = 0; |
| 1000 | |
| 1001 | spin_lock_irqsave(&uart->port.lock, flags); |
| 1002 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); |
| 1003 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 1004 | |
| 1005 | } |
| 1006 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1007 | static struct console bfin_serial_console = { |
| 1008 | .name = BFIN_SERIAL_NAME, |
| 1009 | .write = bfin_serial_console_write, |
| 1010 | .device = uart_console_device, |
| 1011 | .setup = bfin_serial_console_setup, |
| 1012 | .flags = CON_PRINTBUFFER, |
| 1013 | .index = -1, |
| 1014 | .data = &bfin_serial_reg, |
| 1015 | }; |
| 1016 | |
| 1017 | static int __init bfin_serial_rs_console_init(void) |
| 1018 | { |
| 1019 | bfin_serial_init_ports(); |
| 1020 | register_console(&bfin_serial_console); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1021 | #ifdef CONFIG_KGDB_UART |
| 1022 | kgdb_entry_state = 0; |
| 1023 | init_kgdb_uart(); |
| 1024 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1025 | return 0; |
| 1026 | } |
| 1027 | console_initcall(bfin_serial_rs_console_init); |
| 1028 | |
| 1029 | #define BFIN_SERIAL_CONSOLE &bfin_serial_console |
| 1030 | #else |
| 1031 | #define BFIN_SERIAL_CONSOLE NULL |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 1032 | #endif /* CONFIG_SERIAL_BFIN_CONSOLE */ |
| 1033 | |
| 1034 | |
| 1035 | #ifdef CONFIG_EARLY_PRINTK |
| 1036 | static __init void early_serial_putc(struct uart_port *port, int ch) |
| 1037 | { |
| 1038 | unsigned timeout = 0xffff; |
| 1039 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 1040 | |
| 1041 | while ((!(UART_GET_LSR(uart) & THRE)) && --timeout) |
| 1042 | cpu_relax(); |
| 1043 | UART_PUT_CHAR(uart, ch); |
| 1044 | } |
| 1045 | |
| 1046 | static __init void early_serial_write(struct console *con, const char *s, |
| 1047 | unsigned int n) |
| 1048 | { |
| 1049 | struct bfin_serial_port *uart = &bfin_serial_ports[con->index]; |
| 1050 | unsigned int i; |
| 1051 | |
| 1052 | for (i = 0; i < n; i++, s++) { |
| 1053 | if (*s == '\n') |
| 1054 | early_serial_putc(&uart->port, '\r'); |
| 1055 | early_serial_putc(&uart->port, *s); |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | static struct __init console bfin_early_serial_console = { |
| 1060 | .name = "early_BFuart", |
| 1061 | .write = early_serial_write, |
| 1062 | .device = uart_console_device, |
| 1063 | .flags = CON_PRINTBUFFER, |
| 1064 | .setup = bfin_serial_console_setup, |
| 1065 | .index = -1, |
| 1066 | .data = &bfin_serial_reg, |
| 1067 | }; |
| 1068 | |
| 1069 | struct console __init *bfin_earlyserial_init(unsigned int port, |
| 1070 | unsigned int cflag) |
| 1071 | { |
| 1072 | struct bfin_serial_port *uart; |
| 1073 | struct ktermios t; |
| 1074 | |
| 1075 | if (port == -1 || port >= nr_ports) |
| 1076 | port = 0; |
| 1077 | bfin_serial_init_ports(); |
| 1078 | bfin_early_serial_console.index = port; |
Robin Getz | 0ae5364 | 2007-10-09 17:24:49 +0800 | [diff] [blame] | 1079 | uart = &bfin_serial_ports[port]; |
| 1080 | t.c_cflag = cflag; |
| 1081 | t.c_iflag = 0; |
| 1082 | t.c_oflag = 0; |
| 1083 | t.c_lflag = ICANON; |
| 1084 | t.c_line = port; |
| 1085 | bfin_serial_set_termios(&uart->port, &t, &t); |
| 1086 | return &bfin_early_serial_console; |
| 1087 | } |
| 1088 | |
| 1089 | #endif /* CONFIG_SERIAL_BFIN_CONSOLE */ |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1090 | |
| 1091 | static struct uart_driver bfin_serial_reg = { |
| 1092 | .owner = THIS_MODULE, |
| 1093 | .driver_name = "bfin-uart", |
| 1094 | .dev_name = BFIN_SERIAL_NAME, |
| 1095 | .major = BFIN_SERIAL_MAJOR, |
| 1096 | .minor = BFIN_SERIAL_MINOR, |
Graf Yang | 2ade972 | 2008-04-25 02:55:49 +0800 | [diff] [blame] | 1097 | .nr = BFIN_UART_NR_PORTS, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1098 | .cons = BFIN_SERIAL_CONSOLE, |
| 1099 | }; |
| 1100 | |
| 1101 | static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state) |
| 1102 | { |
| 1103 | struct bfin_serial_port *uart = platform_get_drvdata(dev); |
| 1104 | |
| 1105 | if (uart) |
| 1106 | uart_suspend_port(&bfin_serial_reg, &uart->port); |
| 1107 | |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
| 1111 | static int bfin_serial_resume(struct platform_device *dev) |
| 1112 | { |
| 1113 | struct bfin_serial_port *uart = platform_get_drvdata(dev); |
| 1114 | |
| 1115 | if (uart) |
| 1116 | uart_resume_port(&bfin_serial_reg, &uart->port); |
| 1117 | |
| 1118 | return 0; |
| 1119 | } |
| 1120 | |
| 1121 | static int bfin_serial_probe(struct platform_device *dev) |
| 1122 | { |
| 1123 | struct resource *res = dev->resource; |
| 1124 | int i; |
| 1125 | |
| 1126 | for (i = 0; i < dev->num_resources; i++, res++) |
| 1127 | if (res->flags & IORESOURCE_MEM) |
| 1128 | break; |
| 1129 | |
| 1130 | if (i < dev->num_resources) { |
| 1131 | for (i = 0; i < nr_ports; i++, res++) { |
| 1132 | if (bfin_serial_ports[i].port.mapbase != res->start) |
| 1133 | continue; |
| 1134 | bfin_serial_ports[i].port.dev = &dev->dev; |
| 1135 | uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port); |
| 1136 | platform_set_drvdata(dev, &bfin_serial_ports[i]); |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | return 0; |
| 1141 | } |
| 1142 | |
| 1143 | static int bfin_serial_remove(struct platform_device *pdev) |
| 1144 | { |
| 1145 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); |
| 1146 | |
| 1147 | |
| 1148 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 1149 | gpio_free(uart->cts_pin); |
| 1150 | gpio_free(uart->rts_pin); |
| 1151 | #endif |
| 1152 | |
| 1153 | platform_set_drvdata(pdev, NULL); |
| 1154 | |
| 1155 | if (uart) |
| 1156 | uart_remove_one_port(&bfin_serial_reg, &uart->port); |
| 1157 | |
| 1158 | return 0; |
| 1159 | } |
| 1160 | |
| 1161 | static struct platform_driver bfin_serial_driver = { |
| 1162 | .probe = bfin_serial_probe, |
| 1163 | .remove = bfin_serial_remove, |
| 1164 | .suspend = bfin_serial_suspend, |
| 1165 | .resume = bfin_serial_resume, |
| 1166 | .driver = { |
| 1167 | .name = "bfin-uart", |
Kay Sievers | e169c13 | 2008-04-15 14:34:35 -0700 | [diff] [blame] | 1168 | .owner = THIS_MODULE, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1169 | }, |
| 1170 | }; |
| 1171 | |
| 1172 | static int __init bfin_serial_init(void) |
| 1173 | { |
| 1174 | int ret; |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1175 | #ifdef CONFIG_KGDB_UART |
| 1176 | struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 1177 | struct ktermios t; |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1178 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1179 | |
| 1180 | pr_info("Serial: Blackfin serial driver\n"); |
| 1181 | |
| 1182 | bfin_serial_init_ports(); |
| 1183 | |
| 1184 | ret = uart_register_driver(&bfin_serial_reg); |
| 1185 | if (ret == 0) { |
| 1186 | ret = platform_driver_register(&bfin_serial_driver); |
| 1187 | if (ret) { |
| 1188 | pr_debug("uart register failed\n"); |
| 1189 | uart_unregister_driver(&bfin_serial_reg); |
| 1190 | } |
| 1191 | } |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1192 | #ifdef CONFIG_KGDB_UART |
| 1193 | if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) { |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 1194 | request_irq(uart->port.irq, bfin_serial_rx_int, |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1195 | IRQF_DISABLED, "BFIN_UART_RX", uart); |
| 1196 | pr_info("Request irq for kgdb uart port\n"); |
Sonic Zhang | a359cca | 2007-10-10 16:47:58 +0800 | [diff] [blame] | 1197 | UART_SET_IER(uart, ERBFI); |
Mike Frysinger | d5148ff | 2007-07-25 11:57:42 +0800 | [diff] [blame] | 1198 | SSYNC(); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1199 | t.c_cflag = CS8|B57600; |
| 1200 | t.c_iflag = 0; |
| 1201 | t.c_oflag = 0; |
| 1202 | t.c_lflag = ICANON; |
| 1203 | t.c_line = CONFIG_KGDB_UART_PORT; |
| 1204 | bfin_serial_set_termios(&uart->port, &t, &t); |
| 1205 | } |
| 1206 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1207 | return ret; |
| 1208 | } |
| 1209 | |
| 1210 | static void __exit bfin_serial_exit(void) |
| 1211 | { |
| 1212 | platform_driver_unregister(&bfin_serial_driver); |
| 1213 | uart_unregister_driver(&bfin_serial_reg); |
| 1214 | } |
| 1215 | |
| 1216 | module_init(bfin_serial_init); |
| 1217 | module_exit(bfin_serial_exit); |
| 1218 | |
| 1219 | MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>"); |
| 1220 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); |
| 1221 | MODULE_LICENSE("GPL"); |
| 1222 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); |
Kay Sievers | e169c13 | 2008-04-15 14:34:35 -0700 | [diff] [blame] | 1223 | MODULE_ALIAS("platform:bfin-uart"); |